Ammunition magazine

Abstract

The present disclosure provides ammunition magazines for bottom-loading a 5.7×28 mm ammunition round or a 4.6×30 mm ammunition round into a standard AR-15 or M16 upper receiver.

What is claimed is: 
     
       1. An ammunition magazine configured to bottom-feed a plurality of ammunition rounds into an upper receiver of a firearm, the ammunition magazine comprising:
 a magazine housing including two opposing lateral tines, a tail recess, a catch, and a floor plate receiver; 
 a spring within the magazine housing; 
 a floor plate retainer disposed at a bottom end of the spring; 
 a floor plate disposed at a bottom end of the magazine housing and reversibly mated with the floor plate retainer; and 
 a magazine follower disposed at a top end of the spring, the magazine follower including:
 a cartridge-shaped protrusion on a top surface, 
 a concave surface on the top surface and disposed adjacent to the cartridge-shaped protrusion, 
 an opening disposed vertically through the magazine follower and through the top surface, 
 a front leg including a front recess disposed vertically along the front leg, 
 a rear leg disposed generally opposite the front leg, 
 a pair of lateral recesses configured to slidably mate with the two opposing lateral tines, and 
 a tail fin disposed adjacent the rear leg and configured to slidably mate with the tail recess. 
 
 
     
     
       2. The ammunition magazine of  claim 1 , wherein the ammunition rounds are 5.7×28 mm rounds. 
     
     
       3. The ammunition magazine of  claim 1 , wherein the ammunition rounds are 4.6×30 mm rounds.